How many times through history has the atomic theory been majorly revised

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

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8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these